Cycle-commute 17 miles each way in Bedfordshire. Enjoy long distance stuff, managed 402 miles in 24 hours in 2017. I'm an electronics engineer, and also web-based-software designer for custom industrial applications such as measuring production line efficiency, graphing trends, and so on. PHP, mySQL, HTML5 ... Originally from Harare, Zimbabwe where I was born and edumacated. Enjoy playing bass guitar, mostly sungura, jit and museve style.

Popped into the builders merchants and ordered 12000 bricks. "Wocha building?"asked the salesman.
"A barbeque" I said proudly. "Geez, you wont need 12000 bricks!" he said. "Yeah I will, I live on the 5th floor"

The Rohloff website goes into considerable detail regarding efficiency compared to derailleur. Some well considered testing methods too. Total drivechain efficiency looks comparable to derailleur. I'm just a little scared-off by the complexity - I like simple.